from matplotlib import pyplot as plt, font_manager

y_3 = [11,17,16,11,12,11,12,6,6,7,8,9,12,15,14,17,18,21,16,17,20,14,15,15,15,19,21,22,22,22,23]
y_10 = [26,26,28,19,21,17,16,19,18,20,20,19,22,23,17,20,21,20,22,15,11,15,5,13,17,10,11,13,12,13,6]

x_3 = range(1, 32)
x_10 = range(51, 82)

plt.figure(figsize=(20, 8), dpi=80)

#设置字体(这样可以显示中文字体)
my_font = font_manager.FontProperties(fname='C:\Windows\Fonts\simsun.ttc', size=12)

#画散点图
plt.scatter(x_3, y_3, label = '3月份')
plt.scatter(x_10, y_10, label = '10月份')

_x = list(x_3) + list(x_10)
_xtick_labels = ['3月{}日'.format(i) for i in x_3]
_xtick_labels += ['10月{}日'.format(i - 50) for i in x_10]

plt.xticks(_x[::3], _xtick_labels[::3], fontproperties = my_font, rotation = 45)
plt.yticks(range(min(y_3 + y_10), max(y_3 + y_10) + 1))

#添加图例
plt.legend(prop = my_font, loc = 2)

#设置描述信息
plt.xlabel('时间', fontproperties = my_font)
plt.ylabel('温度（℃）', fontproperties = my_font)
plt.title('统计月份温度', fontproperties = my_font, size = 19)


plt.grid(alpha = 0.4, linestyle = ':')

plt.show()